field ambulance

noun
  1. military a mobile medical unit that accepts casualties from forward units, treating the lightly wounded and stabilizing the condition of the seriously wounded before evacuating them to a hospital
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Historical Examples of field ambulance